Note: that when you archive mails and you don’t have an online archive that the mails will be archived to a local PST file on your hard disc drive. If your computer is lost or stolen or breaks then you will lose the archived mails, unless you have a backup of the PST file.

If the Quota Information option is not available then it most likely means that your quota is unlimited – i.e. there is no quota and your mailbox can grow in size as much as there is available space on the server.